Improvement in sewing-machines



J. & A. w. SANGSTERQ Sewing Machine. N0.19,723. Patented March 23',1858.

finesse." Z2 7'.

ma n w Q7 45 J. F is the main shaft.

UNITED STATES PATENT OFFICE.

JAMES SANGSTER AND AMOS W. SANGSTER, OF' BUFFALO, NEW YORK.

IMPROV EMENT IN SEWING-MACHINES.

Specification forming partof Letters (Patent No. 19,723, dated March 23,1858.

.To all whom it may concern: Be it known that we, JAMES SANGsTER andAMOS WV. SANGSTER, of Buffalo, in Erie county,

and State of New York, have invented certain new and useful Improvementsin Sewing-Ma chines; and we declare the following description of ourmethod of constructing the same to be sufficiently clear and exact toenable others skilled in the art to make and use our invention, arid forthat purpose reference is had to to the base Q. A is a spool containingthe thread; B, the feeding-lever. C is aset-screw attached to the platemarked J, for the purpose of regulating or adjusting the feed motion, sothat the length of the stitch may be varied. This set-screw works in theframe M, which surrounds the lever-bar, and is fastened to the lowerpart of the slotted plate marked G is a handle attached to the fiy-wheelL for the purpose of turning said shaft. D is a circular plate attachedto and revolving with the shaft F. To the plate D-is attached a smallpin, E, which moves along and within the slot K in plate J. This plate Jis firmly fastened to the upright rod or shaft H. It will be readilyseen that a revolution of the shaft F will cause an up-anddown (orvertical) motion of the shaft H and 'plate J, together with theset-screw G. The

point of the set-screw butts against the upper part of the saidlever-bar, (which is bent, as

shown in the drawings,) when the shaft is ascending, thus throwing theupper part of the lever-bar toward the shaft H and moving the lowerpartin a contrary direction, which pushes the cloth one stitch ahead.The downward motion reverses the action of the lever-bar. This is doneby means of the small pin O,which passes through the frame M.

Fig. 2 is aplan view of the loopers, show- 'ing the inanner in which theloop is held while the point of the needle is passing through it. A Aare two pieces of metal projecting outward for the purpose of keepingthe loop in I its place, or from being caught in any other part of themachinery, except by the little projecting points B B. G is the upperend of the upright plate, as will be better seen by refer ence to letterG in Fig. 3. D D is a framepiece, which slides upand down the uprightpiece G. S is a bed-piece, which is made hollow and filled with lead orother soft metal. This bed-plate is made in the center of the upper partof frame D D. Into this the needlepoint presses and makes a bed foritself (or forms a cavity the shape of itspoint) when operating.

Fig. 3 is a side elevation of the looping apparatus complete with itsdifferent parts closed and holding the'loop, so that the needle may passthrough it. E E are two flanges projecting outward from the frames H H.D D is a frame-piece, with notches cut in at F F. This .frame or crosspiece fits over the flanges E E,

(the flanges sliding between the notches F F,)

and part of it surrounds the upright piece G,

as will be more readily seen by reference to Fig. 4 at the point markedI I. The piece D D moves up and down the bar G, and carries the frame HH up and down with it. It is carried down by the needle-point pressingdownward into the cavity marked S in Fig. 2, and is forced up as theneedle ascendsbymeans of the spiral spring. (Marked Pin Fig. 6.) Thisspring is placed on the back part of the plate G and presses against thecross-piece D D.

This plate D D in descending first opens the frames H H (at the propertime to let go the loop,) and then carries said frames H H with it inits downward motion. In ascending the said frame D D first closes thelooping-frames H H at the proper timeto catch the loop from the needle,and then follows it in its upward I motion.

In Figs. 3, 4, 5, and 6 are represented friction-springs J J, fastenedto the plate K, upon which the frames H H swing at the point L. Thesefriction-springs hold the plate K, so that the upward or downwardmovement of the cross-piece D D may (or can) open the loopingframes H Hor close them.

(The looper may be operated without the use of the spiral spring P andwithout the operation of the needle for that purpose in its bed-v place,as in these writings described. To make this plan plain, reference maybe had to the drawing in red ink in Fig. 1. Letter A (in red ink)represents a crank connected to a rod, B,

which is fastened to the lever O. This lever lation to each other to theneedle and thread, works on a pivot at D and the end E operatessubstantially as herein set forth. the loopers.) JAMES SANGSTER.

VVhatwe claim as our invention, and desire AMOS WV. SANGSTER. to secureby Letters Patent, is \Vitnesses:

The looper when the several parts thereof V. M. RICE, are constructedand arranged to operate in re- E. B. FoRBUsH.

